Compilare: main.cpp: In function 'void add(Trie*, char*)': main.cpp:23:25: warning: array subscript has type 'char' [-Wchar-subscripts] if (! node -> fii [o]) ^ main.cpp:24:23: warning: array subscript has type 'char' [-Wchar-subscripts] node -> fii [o] = new Trie , ++ node -> cntfii; ^ main.cpp:25:24: warning: array subscript has type 'char' [-Wchar-subscripts] add (node -> fii [o] , p + 1); ^ main.cpp: In function 'int isw(Trie*, char*)': main.cpp:31:25: warning: array subscript has type 'char' [-Wchar-subscripts] if (! node -> fii [o]) ^ main.cpp:33:24: warning: array subscript has type 'char' [-Wchar-subscripts] isw (node -> fii [o] , p + 1); ^